Yamaha dt 125 r 2004 wont start.

Hello i brought a dt today before the test ride the man could not start the bike. he connected a booster to the battery and changed a fuse then it started. when i got home i coulding start it but its turning over.what could be wrong??

Hi m8,, to have to put a booster on it ,,means the battery isny holdin a charge,,if they are stood 4 ages they dont last long,, u must 12v or just over to turn it over,, and while its runnin at least 14,7 volts goin in to the battery,, when it runs,or if u get it goin,, put a tester on the battery terminals,+ and - ,make sure theres 12v,, start her up,, and it should read 14v..if so then the altenater is fine ,,or if the lites get brighter as your revvin it up ,the altenater works fine, if it doesnt star again wen turned off,,,then battery has had it, and wont hold its charge..

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what da ya mean pull with something? Do you use a bribing technique? It a kick start bike, check the electrical system and your kick start mechanism (starter) is not working properly to generate the needed juice.

Check if the spark plug is getting sparks.
Check if the spark plug is wet with fuel after a few cranking.
Hope you have cleaned the carb well ..blowing compressed air to its jets and also checked the float level inthe float chamber.

sounds like you may have a air pocket in your fuel system. try cracking the fuel check on the bottom of the carb and make sure you have fuel. the only other thing i can think of is fouled plugs. I know it sounds funny on a 2 stroke but i have seen it happen